Falkoff, A.D. and Iverson, K.E. "APL language summary"

[HOPL I] (1979) SIGPLAN Notices 14(04) April 1979 including The first ACM SIGPLAN conference on History of programming languages (HOPL) Los Angeles, CA, June 1-3, 1978   Aidan Falkoff

Languages mentioned APL {1960} Array-centered programing language